Reference
Logic St ate. The actual state (true or false) of a signal depends on how
you define its sig nal logic setting, which can be either high-true o r
low-true. Defining a signal as high-true (H) means that signal levels
above (more positive than) the threshold level are true, and signal levels
below (more negative than) the threshold level are false.
A low -true (L) logic setting is just the opposite. Defining a signal
as low-true means that signal levels below (more negative than) the
threshold level are true, and signal levels above (more positive than) the
threshold level are false. Low logi c effectively inverts the signal.
Defining the logical state of a signal lets you use Boolean logic t o
evaluate when a condition is t ru e for two signals.
Boolean Logic. The signal logic (threshold level and high-true/low-true
logic)
defines which part of a waveform cycle is true or false. You then
use Boolean logic to evaluate or compare the logic of two signals as
part of a trigger condition.
118 TDS3000C Series Oscilloscope User Manual
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